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Rescuers, firefighters, policemen, soldiers and volunteers remove rubble and debris from a flattened building in search of survivors after a powerful quake in Mexico City on September 19, 2017. Photo: AFP

Mexican rescuers search for survivors at a flattened building after a powerful quake in Mexico City on September 19, 2017. Photo: AFP

View of buildings flattened by a powerful quake in Mexico City on September 19, 2017. Photo: AFP

A building severely damaged by a powerful quake in Mexico City on September 19, 2017. Photo: AFP

Rescuers, firefighters, policemen, soldiers and volunteers remove rubble and debris from a flattened building in search of survivors after a powerful quake in Mexico City on September 19, 2017. Photo: AFP

Rescuers search for survivors buried under the rubble and debris of a building flattened by a 7.1-magnitude quake in Mexico City on September 19, 2017. Photo: AFP